WO2017193835A1 - System and method for maintaining synchronization in connectionless transmissions - Google Patents

System and method for maintaining synchronization in connectionless transmissions Download PDF

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Publication number
WO2017193835A1
WO2017193835A1 PCT/CN2017/082550 CN2017082550W WO2017193835A1 WO 2017193835 A1 WO2017193835 A1 WO 2017193835A1 CN 2017082550 W CN2017082550 W CN 2017082550W WO 2017193835 A1 WO2017193835 A1 WO 2017193835A1
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WIPO (PCT)
Prior art keywords
pdu
burst transmission
rlc
receiving device
transmission
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PCT/CN2017/082550
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English (en)
French (fr)
Inventor
Nathan Edward Tenny
Xiaoxiao Zheng
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Priority to KR1020187035589A priority Critical patent/KR102209598B1/ko
Priority to AU2017262892A priority patent/AU2017262892B2/en
Priority to RU2018143651A priority patent/RU2701523C1/ru
Priority to CN201780028314.4A priority patent/CN109076475B/zh
Priority to JP2018559208A priority patent/JP6806411B2/ja
Priority to EP17795453.4A priority patent/EP3446522B1/de
Publication of WO2017193835A1 publication Critical patent/WO2017193835A1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present disclosure relates generally to a system and method for digital communications, and, in particular embodiments, to a system and method for maintaining synchronization in connectionless transmissions.
  • the state information of the NAS context needs to remain synchronized between the UE and the network, not only during a single transmission but also after the burst transmission is complete.
  • information from the NAS context e.g., a NAS sequence number
  • the information must remain reliably synchronized or else incorrect decryption will occur.
  • the loss of synchronization may not be detectable, leading to the delivery of garbage data to the application layer.
  • the synchronization requirement results in a need for reliable delivery, e.g., by using an automatic repeat request (ARQ) mechanism in Layer 2.
  • ARQ automatic repeat request
  • Example embodiments provide a system and method for maintaining synchronization in connectionless transmissions.
  • a method for operating a receiving device includes receiving, by the receiving device, a first protocol data unit (PDU) of a first burst transmission, the first PDU including a first transmission identifier (T_ID) associated with the first burst transmission, and the first PDU further including a final PDU indication indicating that the first PDU is a final PDU of the first burst transmission, and releasing, by the receiving device, a first radio link control (RLC) resource associated with the first T_ID when the first RLC resource associated with the first T_ID exists.
  • PDU protocol data unit
  • T_ID transmission identifier
  • RLC radio link control
  • the method also includes sending, by the receiving device, an acknowledgement for the first PDU.
  • the method also includes receiving, by the receiving device, a second PDU of a second burst transmission, the second PDU including a second T_ID associated with the second burst transmission, establishing, by the receiving device, a second RLC resource associated with the second T_ID when the second T_ID is a new T_ID, and indicating, by the receiving device, an error condition when the second T_ID is an old T_ID and when the second T_ID does not have an associated RLC resource.
  • the method also includes updating, by the receiving device, the second T_ID as an old T_ID.
  • the first burst transmission and the second burst transmission are one and the same.
  • the method also includes sending, by the receiving device, an acknowledgement for the second PDU.
  • the acknowledgement and the error condition are sent in a single PDU.
  • Establishing the second RLC resource includes establishing an RLC entity associated with the second burst transmission.
  • the receiving device includes one of a user equipment (UE) in a downlink burst transmission or an access node in an uplink burst transmission.
  • UE user equipment
  • a method for operating a transmitting device includes establishing, by the transmitting device, a RLC resource associated with a T_ID of a burst transmission, sending, by the transmitting device, a first PDU of the burst transmission, the first PDU includes the T_ID and a final PDU indication indicating that the first PDU is a final PDU of the burst transmission, and releasing, by the transmitting device, the RLC resource associated with the T_ID when the transmitting device receives one of an acknowledgement for the first PDU or an error indication associated with the burst transmission.
  • the method also includes sending, by the transmitting device, a second PDU of the burst transmission, the second PDU including the T_ID.
  • the second PDU further includes an initial PDU indication indicating that the second PDU is an initial PDU of the burst transmission.
  • the transmitting device includes one of a UE in an uplink burst transmission or an access node in a downlink burst transmission.
  • a receiving device includes one or more processors, and a computer readable storage medium storing programming for execution by the one or more processors.
  • the programming including instructions to configure the receiving device to receive a first PDU of a first burst transmission, the first PDU includes a first T_ID associated with the first burst transmission, and the first PDU further includes a final PDU indication indicating that the first PDU is a final PDU of the first burst transmission, and release a first RLC resource associated with the first T_ID when the first RLC resource associated with the first T_ID exists.
  • the programming includes instructions to configure the receiving device to send an acknowledgement for the first PDU.
  • the programming includes instructions to configure the receiving device to receive a second PDU of a second burst transmission, the second PDU including a second T_ID associated with the second burst transmission, establish a second RLC resource associated with the second T_ID when the second T_ID is a new T_ID, and indicate an error condition when the second T_ID is an old T_ID and when the second T_ID does not have an associated RLC resource.
  • the programming includes instructions to configure the receiving device to update the second T_ID as an old T_ID.
  • the programming includes instructions to configure the receiving device to send an acknowledgement for the second PDU.
  • a transmitting device includes one or more processors, and a computer readable storage medium storing programming for execution by the one or more processors.
  • the programming including instructions to configure the transmitting device to establish a RLC resource associated with a T_ID of a burst transmission, send a first PDU of the burst transmission, the first PDU includes the T_ID, and a final PDU indication indicating that the first PDU is a final PDU of the burst transmission, and release the RLC resource associated with the T_ID when the transmitting device receives one of an acknowledgement for the first PDU or an error indication associated with the burst transmission.
  • the programming includes instructions to configure the transmitting device to send a second PDU of the burst transmission, the second PDU includes the T_ID.
  • FIG. 1 illustrates an example communications system
  • Figure 2 illustrates a diagram of messages exchanged and processing performed during an uplink burst transmission between an UE and an access node according to embodiments presented herein;
  • Figure 3 illustrates a diagram of messages exchanged and processing performed during an uplink burst transmission highlighting a cryptosync problem according to embodiments presented herein;
  • Figure 4 illustrates example protocol stacks at a UE, an access node, and a CN according to embodiments presented herein;
  • Figure 5 illustrates a flow diagram of example operations occurring in a transmitting device according to embodiments presented herein;
  • Figure 6 illustrates a flow diagram of example operations occurring in a receiving device according to embodiments presented herein;
  • FIG. 7 illustrates a diagram of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information according to embodiments presented herein;
  • Figure 8 illustrates a diagram of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information, highlighting an example handling of an error condition according to embodiments presented herein;
  • FIG. 9 illustrates a diagram of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information, highlighting a receiving device maintaining RLC resources for an extended amount of time to handle retransmissions according to embodiments presented herein;
  • Figure 10 illustrates a detailed view of an example data flow in an uplink burst transmission highlighting a long burst transmission according to embodiments presented herein;
  • Figure 11 illustrates a block diagram of an embodiment processing system for performing methods described herein.
  • Figure 12 illustrates a block diagram of a transceiver adapted to transmit and receive signaling over a telecommunications network according to embodiments presented herein.
  • FIG. 1 illustrates an example communications system 100.
  • Communications system 100 includes an access node 105, such as a Node B, an eNB, a base station, a controller, an access point, a gNode B (gNB) , and so on.
  • access node 105 controls communications to and from UEs, such as UE 110, UE 112, and UE 114, by granting network resources to the communications.
  • UEs may also be commonly referred to as station, mobile station, mobile, user, subscriber, terminal, and so on.
  • UEs can communicate directly with one another without having access node 105 as intermediary.
  • a UE can communicate with other UEs without having to transmit to or receive from access node 105.
  • UEs may also be commonly referred to as mobile stations, mobiles, subscribers, terminals, users, stations, and so on. While it is understood that communications systems may employ multiple access node capable of communicating with a number of UEs, only one access node, and five UEs are illustrated for simplicity.
  • the random access procedure if performed, may be used for obtaining uplink timing or to identify the UE.
  • the random access procedure may also be used to establish routing for user data, such as in the selecting of a MME, if needed.
  • IP Internet Protocol
  • the UE transmits a small amount of data, on the order of one Internet Protocol (IP) packet.
  • IP Internet Protocol
  • the data is encrypted with the NAS security context.
  • the transmission may correspond to one or several radio link control (RLC) protocol data units (PDUs) depending on the Layer 2 configuration. After the transmission completes, no AS context is maintained and the UE goes back to idle state. Burst transmissions are also commonly referred to as short transmissions.
  • RLC radio link control
  • -A UE-access node link uses some form of Layer 2 ARQ mechanism, implying that the transmission is not truly connectionless because there is some RLC context.
  • the transmission may be characterized as being semi-connectionless.
  • CN link handles security, using a counter based mechanism, such as a cryptosync, for example.
  • connection setup such as connection setup, configuration, or release messaging
  • the access node is able to recognize the final PDU of a burst.
  • FIG. 2 illustrates a diagram 200 of messages exchanged and processing performed during an uplink burst transmission between an UE 205 and an access node 210.
  • UE 205 sends PDU1 (event 215) and PDU2 (event 217) to access node 210.
  • UE 205 also sends a poll indication to request acknowledgement (event 219) .
  • Access node 210 sends an acknowledgement for PDU1 and PDU2 (event 221) , such as an RLC STATUS PDU.
  • UE 205 sends PDU3, which happens to be the final PDU of the burst transmission (event 223) .
  • UE 205 also sends a poll indication and an "END BURST" indication (event 225) .
  • Access node 210 sends an acknowledgement for PDU3 (event 227) . However, the acknowledgment for PDU3 is lost.
  • UE 205 never receives the acknowledgement for PDU3 (block 229) .
  • access node 210 assumes that UE 205 successfully receives the acknowledgement for PDU3 and releases RLC state associated with the burst transmission, if any (block 231) .
  • UE 205 assumes that access node 210 did not receive PDU3 and resends PDU3 (event 233) .
  • Access node 210 receives the resent PDU3 but interprets the resent PDU3 as a new burst transmission because the RLC state associated with the burst transmission has been released (block 235) . Therefore, an out-of-sync condition has arisen between UE 205 and access node 210. It is noted that the same situation is possible in downlink transmissions, with only the roles of the communicating devices reversed.
  • Figure 3 illustrates a diagram 300 of messages exchanged and processing performed during an uplink burst transmission highlighting a cryptosync problem.
  • Diagram 300 illustrates messages exchanged and processing performed by a UE 305, an access node 310, and a CN 315.
  • cryptosync counters at UE 305 and CN 315 are synchronized with the same value N (blocks 320 and 322) .
  • UE 305 uses the value N to encrypt data sent in the short burst (block 324) .
  • UE 305 sends PDUs 1, 2, and 3 to access node 310, which is able to successfully acknowledge PDUs 1 and 2 but acknowledgement associated with PDU3 is lost (events 326) .
  • Access node 310 sends PDUs 1, 2, and 3 to CN 315 (event 328) , which is able to successfully decrypt the PDUs using the value N (block 330) producing good data that is forwarded to the application layer (event 332) .
  • CN 315 increments the cryptosync counter to N+1 (block 334) and access node 310 releases RLC state associated with the burst transmission (block 336) .
  • Access node 310 interprets the resent PDU3 as a new transmission since RLC state has been released (block 340) . Access node 310 also forwards PDU3 to CN 315 (event 342) and acknowledges PDU3 (event 344) . Access node 310 releases the RLC state (block 346) and upon receipt of the acknowledgment for PDU3, UE 305 releases the RLC state (block 348) .
  • CN 315 Upon receipt of PDU3 from access node 310, CN 315 decrypts PDU3 in accordance with the value N+1 (block 350) , which results in garbage data being forwarded to the application layer (event 352) because PDU3 was encrypted in accordance with the value N (block 324, supra) . Both UE 305 and CN 315 increment their respective cryptosync counters to N+1 for UE 305 (block 354) and N+2 for CN 315 (block 356) . The two cryptosync counters are out of sync with no recovery mechanism.
  • connectionful transmissions feature supervisory Layer 3 signaling that is delivered reliably, e.g., by RLC acknowledged mode (AM) operation.
  • AM RLC acknowledged mode
  • the release of such a connection requires a handshake on both sides of the connection before contexts are deleted, therefore, late retransmissions after connection release cannot occur.
  • the receiving device would simply treat the retransmission as invalid data, because with no connection setup procedure associated with the late retransmission, there would be no protocol stack to process the late retransmission.
  • FIG. 4 illustrates example protocol stacks 400 at a UE 405, an access node 410, and a CN 415.
  • the protocol stack at UE 405 includes a physical (PHY) layer entity, a medium access control (MAC) layer entity, a RLC entity, and a packet data convergence protocol (PDCP) entity.
  • the protocol stack at access node 410 includes a PHY layer entity, a MAC layer entity, and a RLC entity.
  • the protocol stack at CN 415 includes a PDCP entity.
  • the RLC entities of UE 405 and access node 410 exchange acknowledgments and ensure reliable delivery between UE 405 and access node 410.
  • the RLC entities may segment packets, but packet segmentation is not necessary.
  • a model similar to 3GPP LTE is shown, using polling and status PDUs for acknowledgements.
  • Other Layer 2 acknowledgement models may alternatively be used without substantive changes to the example embodiments presented herein.
  • both devices consider that a Layer 2 acknowledgement for all RLC PDUs in a burst implies that the burst has been delivered.
  • the PDCP entities of UE 405 and CN 415 provide security for the burst transmissions.
  • Each PDCP PDU is assumed to comprise one burst of data with no segmentation or concatenation.
  • the cryptosync is maintained in the PDCP entities, using PDCP sequence numbers or something similar, for example.
  • -Alternative 1 Use an existing PDCP context in the CN.
  • PDU3 should be recognized as a duplicate PDU by the CN, based on repeated information such as a PDCP sequence number (SN) ;
  • PDU3 does not contain the PDCP SN
  • PDU1 contains the PDCP SN
  • the period of time should be long enough to cover any possible retransmission time, e.g., more than a maximum amount of time within which a retransmission of an RLC PDU due to a lost acknowledgement is possible;
  • New information is added to support maintaining state information.
  • new information to support maintaining state information may involve more than just simply indicating the initial and/or final (or equivalently, first and/or last) PDU of a burst transmission, because the out-of-sync problem still occurs in a single PDU scenario.
  • new information may include:
  • both sides of burst transmission must maintain their contexts until a bidirectional handshake completes
  • RRC radio resource control
  • -A session ID and/or transaction ID for a burst transmission is established and included in the transmission, e.g., as part of the RLC header.
  • the receiver recognizes the stale identifier and may send an acknowledgment, but does not forward the late retransmission to higher layers;
  • information supporting the maintenance of state information is added to PDUs.
  • the information includes a new transmission identifier T_ID is included in the initial RLC PDU of a session (i.e., a burst transmission) .
  • the newness of the T_ID may be defined based on a sliding window on a list of possible T_IDs or a timer that is scoped to a particular pair of devices participating in the burst transmission, such that a particular value of T_ID is not reused between the same pair of devices until the timer expires.
  • the timer needs to be longer in duration than the maximum possible retransmission time.
  • the timer does not preclude the starting of a new burst transmission with another new T_ID, and thus does not force a minimum delay time between successive burst transmissions.
  • New RLC resources such as a new RLC entity and/or a new RLC context, are established at the endpoints of the communication to support the new T_ID.
  • Other RLC PDUs of the burst transmission also include the information, such as the new T_ID.
  • a device receiving a single RLC PDU may be able to identify by the T_ID what transmission the PDU is part of, even if it does not contain other information such as a PDCP SN.
  • a device receiving a transmission with the new T_ID will establish new RLC resources, such as a new RLC entity and/or a new RLC context, associated with the new T_ID.
  • An ARQ mechanism such as RLC AM, operates as usual within the new RLC resources.
  • RLC PDU indication is used.
  • An explicit flag in the RLC header or an implicit indication may be used as the initial RLC PDU indication.
  • associated RLC resources such as the RLC entities and/or the RLC context
  • T_ID is stored or remembered.
  • the T_ID is stored or remembered for a period of time, for example.
  • a sliding window technique may be used.
  • the detection of the end of the burst transmission uses a final RLC PDU indication, which may be implemented as an explicit flag in the RLC header or an implicit indication. Acknowledgements may be sent after the final RLC PDU and the final RLC PDU indication may serve as an implicit poll causing such acknowledgements to be sent.
  • the device receiving the final RLC PDU may automatically send a status PDU, prior to releasing or deleting the RLC resources, for example.
  • receiving a data RLC PDU with an old T_ID is an error condition.
  • the error condition may be answered with an indication, such as an already completed session indication.
  • the use of the indication helps to prevent additional retransmission.
  • the indication may also serve as an acknowledgement of the receipt of the final RLC PDU.
  • the error condition may be ignored at the receiver, resulting in sending an acknowledgement indication, for instance, an RLC STATUS PDU, for the data RLC PDU.
  • the final RLC PDU of a session (i.e., a burst transmission) includes an indication indicating it is the final RLC PDU of the session.
  • the indication may be referred to as a final RLC PDU indication and is part of the information supporting the maintenance of state information.
  • a receiving device receiving a RLC PDU with the final RLC PDU indication may delete or release RLC resources associated with the T_ID (also included with the RLC PDU) .
  • Figure 5 illustrates a flow diagram of example operations 500 occurring in a transmitting device.
  • Operations 500 may be indicative of operations occurring in a sending device, such as a UE in an uplink burst transmission or an access node in a downlink burst transmission, as the sending device uses additional information in PDUs to facilitate maintenance of state information.
  • Operations 500 begin with the sending device establishing RLC resources, such as an RLC entity and/or an RLC context, for a new T_ID (block 505) .
  • the new T_ID is associated with a new session (i.e., a new burst transmission) being sent by the sending device.
  • the sending device generates an initial RLC PDU of the session, the initial RLC PDU including the new T_ID (block 510) .
  • the sending device sends the initial RLC PDU to the receiving device (block 515) .
  • the sending device generates and sends additional RLC PDUs as needed for the burst transmission (block 520) .
  • the additional RLC PDUs also include the new T_ID.
  • the final RLC PDU of the burst transmission also includes a final RLC PDU indication (in addition to the new T_ID) , as discussed previously.
  • the sending device receives acknowledgements for the RLC PDUs (block 525) .
  • the sending device requests the acknowledgements by sending a message, such as a poll message, to the receiving device.
  • the receiving device automatically sends acknowledgements for the RLC PDUs received, as long as the T_ID included in the RLC PDUs is correct.
  • the sending device performs a check to determine if an acknowledgement for the final RLC PDU has been received (block 530) .
  • the sending device deletes or releases RLC resources associated with the T_ID (block 535) . If the acknowledgement for the final RLC PDU has not been received, the sending device returns to block 530 to wait for the acknowledgement.
  • a time out mechanism or a number of times the sending device checks to determine if the acknowledgment has been received may be implemented to prevent the sending device from waiting an extended amount of time for the acknowledgement.
  • the present application provides a method for operating a transmitting device.
  • the method includes establishing, by the transmitting device, a RLC resource associated with a T_ID of a burst transmission, sending, by the transmitting device, a first PDU of the burst transmission, the first PDU includes the T_ID and a final PDU indication indicating that the first PDU is a final PDU of the burst transmission, and releasing, by the transmitting device, the RLC resource associated with the T_ID when the transmitting device receives one of an acknowledgement for the first PDU or an error indication associated with the burst transmission.
  • the method includes sending, by the transmitting device, a second PDU of the burst transmission, the second PDU including the T_ID.
  • the second PDU further includes an initial PDU indication indicating that the second PDU is an initial PDU of the burst transmission.
  • the transmitting device includes one of a UE in an uplink burst transmission or an access node in a downlink burst transmission.
  • Figure 6 illustrates a flow diagram of example operations 600 occurring in a receiving device.
  • Operations 600 may be indicative of operations occurring in a receiving device, such as an access node in an uplink burst transmission or a UE in a downlink burst transmission, as the receiving device uses additional information in PDUs to facilitate maintenance of state information.
  • Operations 600 begin with the receiving device receiving an RLC PDU including a T_ID (block 605) .
  • the receiving device performs a check to determine if the T_ID included in the RLC PDU is an old T_ID (block 610) .
  • a T_ID is old if the T_ID has been used in an already completed burst transmission before expiration of a sliding window or a timer.
  • the receiving device performs another check to determine if the T_ID is a new T_ID (block 615) .
  • the T_ID is a new T_ID if the T_ID has not been used in another burst transmission prior to expiration of a sliding window or a timer.
  • the T_ID is a new T_ID if the T_ID has not been used recently. If the T_ID is a new T_ID, the receiving device establishes RLC resources, e.g., an RLC entity and/or an RLC context, for the T_ID (block 620) . If the T_ID is not a new T_ID (for instance, if it belongs to a currently ongoing burst transmission) , or after the receiving device establishes RLC resources for the T_ID, the receiving device sends an acknowledgement (block 625) . In some example embodiments, the receiving device sends the acknowledgement after receiving a message, such as a poll message or a message containing a polling indication, from the sending device.
  • a message such as a poll message or a message containing a polling indication
  • the receiving device automatically sends the acknowledgement after receiving an RLC PDU that does not include an old T_ID.
  • the receiving device performs another check to determine if the RLC PDU is the final RLC PDU of the burst transmission (block 630) .
  • the final RLC PDU includes a final RLC PDU indication in addition to the T_ID. If the RLC PDU is the final RLC PDU of the burst transmission, the receiving device deletes or releases RLC resources associated with the T_ID (block 635) and returns to block 605 to receive additional RLC PDUs. If the RLC PDU is not the final RLC PDU of the burst transmission, the receiving device returns to block 605 to receive additional RLC PDUs.
  • the receiving device sends an error indication to the sending device (block 640) and returns to block 605 to receive additional RLC PDUs. In addition to the error indication, the receiving device may send an acknowledgement for the RLC PDU with the old T_ID.
  • the present application provides a method for operating a receiving device.
  • the method includes receiving, by the receiving device, a first PDU of a first burst transmission, the first PDU including a first T_ID associated with the first burst transmission, and the first PDU further including a final PDU indication indicating that the first PDU is a final PDU of the first burst transmission, and releasing, by the receiving device, a first RLC resource associated with the first T_ID when the first RLC resource associated with the first T_ID exists.
  • the method includes sending, by the receiving device, an acknowledgement for the first PDU.
  • the method includes includes receiving, by the receiving device, a second PDU of a second burst transmission, the second PDU including a second T_ID associated with the second burst transmission, establishing, by the receiving device, a second RLC resource associated with the second T_ID when the second T_ID is a new T_ID, and indicating, by the receiving device, an error condition when the second T_ID is an old T_ID and when the second T_ID does not have an associated RLC resource.
  • the method includes updating, by the receiving device, the second T_ID as an old T_ID.
  • the first burst transmission and the second burst transmission are one and the same.
  • the method includes sending, by the receiving device, an acknowledgement for the second PDU.
  • the acknowledgement and the error condition are sent in a single PDU.
  • establishing the second RLC resource includes establishing an RLC entity associated with the second burst transmission.
  • the receiving device includes one of a UE in a downlink burst transmission or an access node in an uplink burst transmission.
  • Figure 7 illustrates a diagram 700 of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information.
  • Diagram 700 illustrates messages exchanged and processing performed by a sending device 705 and a receiving device 710 when no transmission errors occur.
  • receiving device 710 sends an acknowledgment corresponding to the final RLC PDU of the burst transmission (event 715)
  • receiving device 710 sends information contained in the burst transmission to upper layers and deletes the RLC resource associated with T_ID (block 720) .
  • sending device 705 receives the acknowledgment corresponding to the final RLC PDU
  • sending device 705 deletes the RLC resource associated with T_ID (block 725) .
  • Figure 8 illustrates a diagram 800 of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information, highlighting an example handling of an error condition.
  • Diagram 800 illustrates messages exchanged and processing performed by a sending device 805 and a receiving device 810 when a transmission error occurs.
  • receiving device 810 sends an acknowledgment corresponding to the final RLC PDU of the burst transmission (event 815) . However, the acknowledgment is lost and not received by sending device 805. After sending the acknowledgement, receiving device 810 forwards information contained in the burst transmission to upper layers and deletes the RLC resource associated with T_ID (block 820) . Sending device 805 does not receive the acknowledgment corresponding to the final RLC PDU, so sending device 805 resends the final RLC PDU (event 825) .
  • the final RLC PDU includes the same T_ID of other RLC PDUs of the burst transmission.
  • Receiving device 810 receives the final RLC PDU with the T_ID and recognizes the final RLC PDU as including an old T_ID (block 830) .
  • Receiving device 810 sends an error indication to sending device 805 (event 835) .
  • the error indication may also include an acknowledgement for the final RLC PDU.
  • receiving device 810 could omit the error indication and only send an acknowledgement for the final RLC PDU.
  • sending device 805 deletes the RLC resource associated with T_ID (block 840) .
  • Figure 9 illustrates a diagram 900 of messages exchanged and processing performed during a burst transmission wherein the RLC PDUs exchanged include additional information to facilitate maintenance of state information, highlighting a receiving device maintaining RLC resources for an extended amount of time to handle retransmissions.
  • Diagram 900 illustrates messages exchanged and processing performed by a sending device 905 and a receiving device 910.
  • receiving device 910 sends an acknowledgment corresponding to the final RLC PDU of the burst transmission (event 915) that is lost in transmission and is not received by sending device 905. Unlike the scenario illustrated in Figure 8, receiving device 910 does not immediately delete RLC resources associated with the T_ID of the final RLC PDU.
  • Receiving device 910 sends an error indication to sending device 905 (event 925) .
  • the error indication may also include an acknowledgement for the final RLC PDU.
  • the transmission ID for each burst transmission is selected by the sending device, with both the sending device and the receiving device considering that the transmission ID is scoped for the device pair (the sending device and the receiving device) .
  • different device pairs may use the same transmission IDs without collision.
  • a first UE-access node pair and a second UE-access node pair, where the access node is the same in both pairs can use the same transmission ID without collision.
  • an identifier of the UE (the sending device) be conveyed to the access node.
  • the sending device may send a freshness parameter, such as a nonce or a time based value, as part of the transmission ID.
  • validity of the transmission ID is checked based on a windowing system.
  • Both devices of a device pair maintain a list (or equivalently a bitmap or similar representation) of transmission IDs used between the devices. Then, when starting a new burst transmission, the sending device checks to determine if the list is empty. If the list is empty, the sending device may pick an arbitrary transmission ID. If the list is not empty, the sending device may pick the lowest transmission ID not already used for the transmission ID of the burst transmission and update the list.
  • the receiving device checks to determine if the transmission ID is in the list. If the transmission ID is in the list, the receiving device treats the RLC PDU as a repetition from a previous burst transmission. If the transmission ID is not in the list, the receiving device establishes new RLC resources associated with the transmission ID and updates the list.
  • the example embodiments may have the following impact on RLC:
  • the transmission ID is added to data PDU formats used for burst transmissions, with the following impacts:
  • a new protocol may be designed with the transmission ID in the header.
  • the indication bits may be designed from the beginning.
  • FIG 10 illustrates a detailed view of an example data flow 1000 in an uplink burst transmission highlighting a relatively long burst transmission that requires segmentation into multiple RLC PDUs to transmit over the air.
  • Data flow 1000 involves data moving from a UE 1005 to an access node 1010 and ending at a CN 1015.
  • Cryptosync reuse is a situation when a value used as the cryptosync repeats, leading to problems such as vulnerability to decryption by an attacker who obtains two blocks of data encrypted with the same key and the same cryptosync.
  • Cryptosync reuse arises when the amount of data being transmitted is too large or if the individual blocks of data for encryption, e.g., PDUs of the protocol layer that performs the encryption, are too small.
  • One way to avoid cryptosync reuse when a large amount of data is involved is to segment the data into multiple smaller parts, with each part being small enough so that the cryptosync can be relied upon to not repeat.
  • the parts e.g., RLC SDUs
  • the parts could be sized so as to produce a number of RLC PDUs that will not cause the RLC SN to repeat.
  • a possible cryptosync may be expressed as: transmission ID + RLC SN, where the transmission ID changes for each RLC SDU.
  • each RLC SDU gives rise to a sequence of cryptosync values that never repeat because they are distinguished from one another by RLC SN, and between different RLC SDUs the cryptosync values will not repeat because they are distinguished from one another by transmission ID.
  • This technique may be visualized as combining PDCP with RLC segmentation in an upper RLC sublayer. Alternatively, the technique may be visualized as moving segmentation and duplicate detection into PDCP.
  • the transmission ID may be omitted if the RLC SN, which in this case is the PDCP SN, by itself is long enough to avoid frequent RLC SN rollover.
  • An upper Layer 2 entity located in a CN and/or UE may be used for re-ordering, as well as encrypting and/or decrypting the information. Infrequent cases of RLC SN rollover may be handled with a rekeying or similar procedure, so that reuse of the same cryptosync with the same key never occurs. In this case, for purposes of cryptosync management, each UE context in CN 1015 is considered as one continuous session.
  • the present application provides a receiving device.
  • the receiving device includes a processor, and a computer readable storage medium storing programming for execution by the processor.
  • the programming including instructions to configure the receiving device to receive a first PDU of a first burst transmission, the first PDU includes a first T_ID associated with the first burst transmission, and the first PDU further includes a final PDU indication indicating that the first PDU is a final PDU of the first burst transmission, and release a first RLC resource associated with the first T_ID when the first RLC resource associated with the first T_ID exists.
  • the programming includes instructions to configure the receiving device to send an acknowledgement for the first PDU.
  • the programming includes instructions to configure the receiving device to receive a second PDU of a second burst transmission, the second PDU including a second T_ID associated with the second burst transmission, establish a second RLC resource associated with the second T_ID when the second T_ID is a new T_ID, and indicate an error condition when the second T_ID is an old T_ID and when the second T_ID does not have an associated RLC resource.
  • the programming includes instructions to configure the receiving device to update the second T_ID as an old T_ID.
  • the programming includes instructions to configure the receiving device to send an acknowledgement for the second PDU.
  • the present application provides a transmitting device.
  • the transmitting device includes a processor, and a computer readable storage medium storing programming for execution by the processor.
  • the programming including instructions to configure the transmitting device to establish a RLC resource associated with a T_ID of a burst transmission, send a first PDU of the burst transmission, the first PDU includes the T_ID, and a final PDU indication indicating that the first PDU is a final PDU of the burst transmission, and release the RLC resource associated with the T_ID when the transmitting device receives one of an acknowledgement for the first PDU or an error indication associated with the burst transmission.
  • the programming includes instructions to configure the transmitting device to send a second PDU of the burst transmission, the second PDU includes the T_ID.
  • Figure 11 illustrates a block diagram of an embodiment processing system 1100 for performing methods described herein, which may be installed in a host device.
  • the processing system 1100 includes a processor 1104, a memory 1106, and interfaces 1110-1114, which may (or may not) be arranged as shown in Figure 11.
  • the processor 1104 may be any component or collection of components adapted to perform computations and/or other processing related tasks
  • the memory 1106 may be any component or collection of components adapted to store programming and/or instructions for execution by the processor 1104.
  • the memory 1106 includes a non-transitory computer readable medium.
  • the interfaces 1110, 1112, 1114 may be any component or collection of components that allow the processing system 1100 to communicate with other devices/components and/or a user.
  • one or more of the interfaces 1110, 1112, 1114 may be adapted to communicate data, control, or management messages from the processor 1104 to applications installed on the host device and/or a remote device.
  • one or more of the interfaces 1110, 1112, 1114 may be adapted to allow a user or user device (e.g., personal computer (PC) , etc. ) to interact/communicate with the processing system 1100.
  • the processing system 1100 may include additional components not depicted in Figure 11, such as long term storage (e.g., non-volatile memory, etc. ) .
  • the processing system 1100 is included in a network device that is accessing, or part otherwise of, a telecommunications network.
  • the processing system 1100 is in a network-side device in a wireless or wireline telecommunications network, such as a base station, a relay station, a scheduler, a controller, a gateway, a router, an applications server, or any other device in the telecommunications network.
  • the processing system 1100 is in a user-side device accessing a wireless or wireline telecommunications network, such as a mobile station, a user equipment (UE) , a personal computer (PC) , a tablet, a wearable communications device (e.g., a smartwatch, etc. ) , or any other device adapted to access a telecommunications network.
  • one or more of the interfaces 1110, 1112, 1114 connects the processing system 1100 to a transceiver adapted to transmit and receive signaling over the telecommunications network.
  • Figure 12 illustrates a block diagram of a transceiver 1200 adapted to transmit and receive signaling over a telecommunications network.
  • the transceiver 1200 may be installed in a host device. As shown, the transceiver 1200 comprises a network-side interface 1202, a coupler 1204, a transmitter 1206, a receiver 1208, a signal processor 1210, and a device-side interface 1212.
  • the network-side interface 1202 may include any component or collection of components adapted to transmit or receive signaling over a wireless or wireline telecommunications network.
  • the coupler 1204 may include any component or collection of components adapted to facilitate bi-directional communication over the network-side interface 1202.
  • the transmitter 1206 may include any component or collection of components (e.g., up-converter, power amplifier, etc. ) adapted to convert a baseband signal into a modulated carrier signal suitable for transmission over the network-side interface 1202.
  • the receiver 1208 may include any component or collection of components (e.g., down-converter, low noise amplifier, etc. ) adapted to convert a carrier signal received over the network-side interface 1202 into a baseband signal.
  • the signal processor 1210 may include any component or collection of components adapted to convert a baseband signal into a data signal suitable for communication over the device-side interface (s) 1212, or vice-versa.
  • the device-side interface (s) 1212 may include any component or collection of components adapted to communicate data-signals between the signal processor 1210 and components within the host device (e.g., the processing system 1100, local area network (LAN) ports, etc. ) .
  • the host device e.g., the processing system 1100, local area network (LAN) ports, etc.
  • the transceiver 1200 may transmit and receive signaling over any type of communications medium.
  • the transceiver 1200 transmits and receives signaling over a wireless medium.
  • the transceiver 1200 may be a wireless transceiver adapted to communicate in accordance with a wireless telecommunications protocol, such as a cellular protocol (e.g., long-term evolution (LTE) , etc. ) , a wireless local area network (WLAN) protocol (e.g., Wi-Fi, etc. ) , or any other type of wireless protocol (e.g., Bluetooth, near field communication (NFC) , etc. ) .
  • the network-side interface 1202 comprises one or more antenna/radiating elements.
  • the network-side interface 1202 may include a single antenna, multiple separate antennas, or a multi-antenna array configured for multi-layer communication, e.g., single input multiple output (SIMO) , multiple input single output (MISO) , multiple input multiple output (MIMO) , etc.
  • the transceiver 1200 transmits and receives signaling over a wireline medium, e.g., twisted-pair cable, coaxial cable, optical fiber, etc.
  • Specific processing systems and/or transceivers may utilize all of the components shown, or only a subset of the components, and levels of integration may vary from device to device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
PCT/CN2017/082550 2016-05-11 2017-04-28 System and method for maintaining synchronization in connectionless transmissions Ceased WO2017193835A1 (en)

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KR1020187035589A KR102209598B1 (ko) 2016-05-11 2017-04-28 비연결형 송신에서 동기를 유지하는 시스템 및 방법
AU2017262892A AU2017262892B2 (en) 2016-05-11 2017-04-28 System and method for maintaining synchronization in connectionless transmissions
RU2018143651A RU2701523C1 (ru) 2016-05-11 2017-04-28 Система и способ обеспечения синхронизации в передачах в режиме без соединения
CN201780028314.4A CN109076475B (zh) 2016-05-11 2017-04-28 一种用于保持无连接传输中同步的方法和系统
JP2018559208A JP6806411B2 (ja) 2016-05-11 2017-04-28 コネクションレス伝送における同期維持のためのシステムおよび方法
EP17795453.4A EP3446522B1 (de) 2016-05-11 2017-04-28 Vorrichtung und verfahren zur synchronisationsbewahrung in der verbindungslosen übertragung

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US201662334740P 2016-05-11 2016-05-11
US62/334,740 2016-05-11
US15/484,540 US10492099B2 (en) 2016-05-11 2017-04-11 System and method for maintaining synchronization in connectionless transmissions
US15/484,540 2017-04-11

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US20200092751A1 (en) 2020-03-19
KR102209598B1 (ko) 2021-01-28
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EP3446522B1 (de) 2020-05-13
EP3446522A4 (de) 2019-05-01
EP3446522A1 (de) 2019-02-27
AU2017262892B2 (en) 2020-02-06
CN109076475A (zh) 2018-12-21
US20170332435A1 (en) 2017-11-16
US10979934B2 (en) 2021-04-13
CN109076475B (zh) 2020-10-09
JP6806411B2 (ja) 2021-01-06
RU2701523C1 (ru) 2019-09-27
US10492099B2 (en) 2019-11-26
AU2017262892A1 (en) 2018-12-06

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